package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //  后期需要进行md5加密，然后再进行比对 MD5加密算法是不可逆的，所以不能直接用明文密码进行比对
        //MD5加密还没有人能够通过算法破解,所谓的碰撞,遇上加盐就没用了
        password= DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     */
    public void add(EmployeeDTO employeeDTO) {
        System.out.println("当前线程的id:"+Thread.currentThread().getId());
        //传递给持久层建议传递实体对象，而不是dto对象
        Employee employee = new Employee();
//        employee.setUsername(employeeDTO.getUsername());
        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);//前提是属性名一致
        //设置账号状态,默认正常
        employee.setStatus(StatusConstant.ENABLE);
        //设置密码
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        //设置当前记录的创建时间和修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录的创建者和修改者
        // 后期需要获取当前登录用户的id 已完成

//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        //调用持久层保存
        employeeMapper.insert(employee);
    }

    /**
     * 分页查询
     * @param employeePageQueryDTO
     * @return
     */
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //select * from employee limit 0,10; pageHelper分页插件
        //pageHelper会动态的拼接sql语句，将分页查询的功能封装到mapper接口中，使用时只需要调用接口即可
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        //我们使用了pageHelper插件所以我们要遵循它的返回值
        Page<Employee>page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total = page.getTotal();
        List<Employee> records = page.getResult();
        return new PageResult(total,records);
    }

    /**
     * 启用或禁用员工
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        // update employee set status = #{status} where id = #{id}
        //构造实体类 传统写法
//        Employee employee = new Employee();
//        employee.setStatus(status);
//        employee.setId(id);

        //用构建器对象
        Employee employee = Employee.builder()
                .status(status).id(id).build();

        //调用持久层更新
        employeeMapper.update(employee);

    }


    /**
     * 根据id查询员工信息
     * @param id
     * @return
     */
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);//但是查出来的可能有密码 但是我不想给前端
        employee.setPassword("******");//将密码隐藏
        return employee;
    }

    /**
     * 更新员工信息
     * @param employeeDTO
     */
    public void update(EmployeeDTO employeeDTO) {
        //传递给持久层建议传递实体对象，而不是dto对象 我们前面Mapper接口已经定义了update方法 但是参数是Employee
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        //设置当前记录的修改时间
//        employee.setUpdateTime(LocalDateTime.now());
        //设置当前记录的修改者
//        employee.setUpdateUser(BaseContext.getCurrentId());
        //调用持久层更新
        employeeMapper.update(employee);

    }

    /**
     * 修改密码
     * @param passwordEditDTO
     */
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        passwordEditDTO.setEmpId(BaseContext.getCurrentId());
        //1、根据员工id查询数据库中的数据
        Employee employee = employeeMapper.getById(passwordEditDTO.getEmpId());
        //2、处理各种异常情况（员工不存在）
        if (employee == null) {
            //员工不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
        //3、密码比对
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());
        if (!oldPassword.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }
        //4、修改密码
        String newPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes());
        employee.setPassword(newPassword);
        //5、更新数据库
        employeeMapper.update(employee);
    }
}
